Rendering became grey after I added an object, not a clipping problem, screenshot attached
From informations you provided:


I don't think your render became grey because you added an object
Grey render in your screenshot is probably Viewport Render Image
(see Manual for more info)
Fact that your render is OK now, with this kind of rendering, is probably because you switched viewport draw mode from "Solid" to "Render", but it has nothing to do with regular camera rendering it is still only viewport render.





To get proper camera render use shortcut F12 (or use this function via top row menu Render > Render Image)